Leviathan ★★½

Slightly above average Alien knock-off that benefits greatly from Stan Winston's creature designs and less embarrassing performances than usual for this sort of thing. Aspects of the plot remind me of the Abyss which actually came out after it, but Cameron's treatment had been kicking around in Hollywood for a few years at that point and I wouldn't be surprised if some exec decided to throw this together as competition. All that aside, if you're in the mood you could do a lot worse (Deep Star Six, Xtro, etc.)